Pulleys - Crank, Underdrive

Pulleys - Crank & Underdrive Pulley Kits

Underdrive pulleys replace the factory crankshaft and accessory pulleys with smaller-diameter, lighter units that reduce parasitic drag from the alternator, power steering pump, and water pump. The result is more horsepower at the wheels — especially at higher RPM where accessory drive losses are most significant.

OneFastShop carries pulleys including underdrive crank pulleys, lightweight aluminum pulleys, underdrive pulley kits with crank, alternator, and water pump pulleys, and direct-fit applications for popular performance engine platforms.

Every pulley at OneFastShop ships brand-new with manufacturer warranty coverage. Whether you're freeing up horsepower with an underdrive kit, replacing a worn factory pulley, or adding a lightweight crank pulley to a track build, OneFastShop has the pulleys. Shop the full pulleys collection today.